Not 'would be', but 'would have been': nationalities aren't marked for gender. As I wrote, 'la germano' was originally masculine, but is now neutral. Thus you'd use it to refer to somebody who is German regardless of gender.

I put "The German comes from Germany." Would it also be correct to say "Germans come from Germany?"

I read somewhere that in Esperanto, unlike English, you refer to an entire group by the singular form with the definite article "la" instead of making the group plural as we do in English. So for example, the Esperanto equivalent of "Dogs bark" is "La hundo bojegas," not "Hundoj bojegas."

Is there a way, once you get a solution correct, to keep trying different translations to see if they work?